/Engine/Source/Editor/UnrealEd/Classes/Factories/TextureFactory.h
Make a UDIM virtual texture from a list of regular 2D textures
UTexture2D* Pointer to the UDIM texture or null if failed
static [UTexture2D](API\Runtime\Engine\Engine\UTexture2D) * MakeUDIMVirtualTextureFromTexture2Ds ( [FString](API\Runtime\Core\Containers\FString) OutputPathName, const [TArray](API\Runtime\Core\Containers\TArray)< [UTexture2D](API\Runtime\Engine\Engine\UTexture2D) * > & SourceTextures, const [TArray](API\Runtime\Core\Containers\TArray)< FIntPoint > & BlockCoords, bool bKeepExistingSettings, bool bCheckOutAndSave )